If your heart skipped a beat when you heard about the latest major online security threat, a bug called Heartbleed, calm down. It's not worth having a heart attack over. But you can't dismiss Heartbleed, either. You likely will have to change some account passwords to protect yourself. "It's safe to say this is the most serious security vulnerability that's ever been on the Internet," said Daniel Lopresti, professor and chairman of the computer science and engineering department at Lehigh University. That said, there haven't been tons of confirmed breaches, as exposed websites have been plugging the hole. But the true impact of Heartbleed likely...

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If your heart skipped a beat when you heard about the latest major online security threat, a bug called Heartbleed, calm down. It's not worth having a heart attack over.
But you can't dismiss Heartbleed, either. You likely will have to change some...